Don't implicitly cast BATCHED_TEST_NAME to qstring

Some tests disable implicit casts from char * to qstring. Use
QStringLiteral in qtest.h to avoid compilation problems with such
tests.

Change-Id: I977b6d90e5a7a8f23298b13789302501606f63d3
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

src/testlib/qtest.h

@@ -628,7 +628,7 @@ void qRegister##TestObject() \
         QTEST_SET_MAIN_SOURCE_PATH \
         return QTest::qExec(&tc, argc, argv); \
     }; \
-    QTest::qRegisterTestCase(BATCHED_TEST_NAME, runTest); \
+    QTest::qRegisterTestCase(QStringLiteral(BATCHED_TEST_NAME), runTest); \
 } \
 \
 Q_CONSTRUCTOR_FUNCTION(qRegister##TestObject)